The property owner found Alonso early Thursday morning after going to check on her cattle who were acting strange. The property owner called the sheriff's office who returned the dog to the kennel. A worker there took Alonso to the Palmer Lake Veterinary Clinic for treatment around 10 a.m.

"He was very weak, could walk in but was wobbly on his legs," Jensen said.

Dr. Jensen estimates that Alonso was tied to the fence post for at least 24 hours, possibly longer. She says he was severely dehydrated and weighed only 66 pounds when he was brought to her office. He typically weighs 88 pounds.

Alonso is expected to stay overnight at the Palmer Lake Veterinary Clinic where he's receiving fluids. He will slowly be given food. Dr. Jensen completed blood work and expects Alonso to make a full recovery.

Police say a homeowner in Palmer Lake found one of the other missing dogs inside his garage. The homeowner contacted the Palmer Lake Police Department and the dog was released back to the kennel.

Another dog, named Duke, remains missing. The dogs were taken from Gunbil German Shepherds in Larkspur.

Police believe the thieves took the dogs between 10 p.m. Friday and 5:30 a.m. Saturday.

The kennel's owner told 9NEWS that two of the dogs taken were "basic trained," meaning they are house pets or for show. The owner said the other dog was "specialty trained" with some military and search-and-rescue training.

The sheriff's office is asking anyone who sees these dogs to use caution and to call the Douglas County Sheriff's Office tip line at 303-660-7579.